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sounds like the compressor is locked up,just unplug the wire at theac compresor,it will need fixed in summer ,$$$,but it will be ok withno ac. The pump runs on defrost to dry the air in order to aid in defrosting.That's why it does that on defrost.The sparks are from theclutch trying to turn a frozen pump. Just unplug the pump.

NOPE STOP CHARGING DONT PUT NO MORE REFRIGERANT IN SYSTEM.DO GOING TO DAMAGE NEW COMPRESSOR AND THE EXCESS PRESSURE WILL BUILD UP CAUSE THE REFRIGERANT CANISTER TO BURST EXPLODE INJURY OR FATALLY HURT YOU. BEST TAKE CAR TO A GARAGE.LET GARAGE PUMP DOWN AC SYSTEM AND CHARGE UP.BECAUSE YOU WILL DAMAGE NEW COMPRESSOR. MOST OF TIME I WILL HOT WIRE THE AC COMPRESSOR. MAKE SURE COMPRESSOR HAS 2 OUNCES OIL IN IT.IF COMPRESSOR START UP NO OIL IT WILL LOCK UP.DONT KEEP PUTTING REFRIGERANT IN THE AC SYSTEM, THE R 134A GOING TO FREEZE UP TOO MUCH MOISTURE IN SYSTEM YOU HAVE TO HAVE A VACUUM PUMP TO PUMP DOWN AC SYSTEM CHECK FOR LEAKS BEFORE CHARGING SYSTEM UP.LOW SIDE NEED TO BE 31 - 36 PSI THE HIGH SIDE SHOULD BE 165 - 205 PSI.

Replacing the water pump on my 2004 5.9 cummins 1ton Dually was easy,Disconnect neg. batt. cables, drain coolant,released serpentine belt tensioner with 1/2" drive ratchet and while in released position slipped belt from ac compressor,removed two bolts that held alt. to brackets, slipped alt. to one side then removed upper alt. brkt., removed two bolts on water pump, made sure mounting surface of block was clean and took new water pump put a small amt. of rtv sealant all around groove that rubber seals goes in,install rubber seal, "be sure and wipe off excess sealant then re-install water pump tightening carefully,reinstall alt. upper brkt., then alt. put belt back in correct position but be sure and leave it off of ac pulley so you can reinstall it on ac when you are underneath the eng. area while releasing tension on belt tensioner. Fill with proper coolant type till you have rad. full. Reinstall cables, start eng and with cap off you will have to add coolant as eng. warms up till it has air out of system. Once rad. is full install cap then refill coolant recovery bottle to full level, Keep and eye on it for leaks for a couple of days and "Happy Driving" Don't think I left anything out :)

get the code and for the first number use no1 button keep pressing it the number of times required till teh right number shows ,then second number on no2 and so on till all four numbers are right then press number 5 to lock it all in

You will need a new fuel pump relay to keep the engine running. The prime switch for the fuel pump operates fine for it starts the engine and once the oil pressure is up to snuff the computer shuts the prime switch off and turns on the fuel pump relay till you shut the engine off

If the water pump is leaking, then you need to replace it, replace the thermostat as well. Make sure you have got all the air out of the cooling system, when you refill the coolant, by undoing the top hose of the radiator till water comes out, likewise with a heater hose, then start and check, when the temperature is right the fans should cut in, keep an eye on the temp guage whilst doing this.
Hope thgis helps